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111-427: At a town meeting at Nantucket on January 24, 1746, the sea captains of the island spoke out for a lighthouse and the sum of 200 pounds was voted "in supposition that the owners of or others concerned in, shipping will maintain a light therein", but the town actually paid for its maintenance. The wood 1746 tower burned in 1758. Town meeting authorized a new light, which was completed in 1759, which lasted until 1774. From

222-432: A constant light (from a fixed lens), one flash per minute (from a rotating lens with eight panels), and two per minute (16 panels). In late 1825, to reduce the loss of light in the reflecting elements, Fresnel proposed to replace each mirror with a catadioptric prism, through which the light would travel by refraction through the first surface, then total internal reflection off the second surface, then refraction through

333-414: A conventional lens by dividing the lens into a set of concentric annular sections. An ideal Fresnel lens would have an infinite number of sections. In each section, the overall thickness is decreased compared to an equivalent simple lens. This effectively divides the continuous surface of a standard lens into a set of surfaces of the same curvature, with stepwise discontinuities between them. In some lenses,

444-455: A cylindrical form while retaining the property of reflecting light from a single point back to that point. Reflectors of this form, paradoxically called "dioptric mirrors", proved particularly useful for returning light from the landward side of the lamp to the seaward side. As lighthouses proliferated, they became harder to distinguish from each other, leading to the use of colored filters, which wasted light. In 1884, John Hopkinson eliminated

555-527: A floor of iron, where rests the lantern, 58 ft (18 m) above the foundation and 47 ft (14 m) above the ground." The fourth order Fresnel lens was first lit on December 10, 1856. The tower is still in place, with its lantern gone, on the grounds of the Coast Guard base. During its active period, it was the front light of a range formed with the Nantucket Beacon ; this range

666-401: A focal length of 920 mm ( 36 + 1 ⁄ 4  in) and stands about 2.59 m (8 ft 6 in) high, and 1.8 m (6 ft) wide. The smallest (sixth) order has a focal length of 150 mm (6 in) and a height of 433 mm ( 17 + 1 ⁄ 16  in). The largest Fresnel lenses are called hyperradiant (or hyper-radial). One such lens was on hand when it

777-525: A frame, fitted at the top for lamps. This was wrecked in a heavy storm in 1788. In August 1789, Congress voted to transfer the colonial lights to the Federal Government. Between then and 1795, another tower was erected on Brant Point. According to a "Memoranda of Cessions by Massachusetts," dated 1795, "The lighthouse on Brant Point with the tenements and land thereto belonging, owned by the State,

888-608: A hotel, were sold by the Federal government as no longer needed for lighthouse purposes. Mystic Seaport Light was built in 1966 as a replica of the 1901 Brant Point Light. Massachusetts General Court Minority (4) Minority (24) Vacant (1) The Massachusetts General Court , formally the General Court of Massachusetts , is the state legislature of the Commonwealth of Massachusetts located in

999-541: A judicial case resulted in another reform in 1638, where the Council of Assistants became an upper house that sat separately, with consent of both houses required to pass legislation. In October 1650 the General Court took exception to the book The Meritorious Price of Our Redemption by William Pynchon . They regarded it as containing many errors and heresies and decided to make their views very plain by having

1110-426: A law. It is usually effective in ninety days. The day after the governor signs the bill is considered to be the first day, and each succeeding day, including Sundays and holidays is counted until the ninetieth. Laws considered "emergency" in nature take effect immediately upon signing if the legislature has voted to attach an "emergency preamble" to the bill. Adoption of the preamble requires a two-thirds standing vote of

1221-548: A lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. Because of its use in lighthouses, it has been called "the invention that saved a million ships". The first person to focus a lighthouse beam using a lens was apparently the London glass-cutter Thomas Rogers, who proposed the idea to Trinity House in 1788. The first Rogers lenses, 53   cm in diameter and 14   cm thick at

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1332-414: A metal housing, a reflector, a lamp assembly, and a Fresnel lens. Many Fresnel instruments allow the lamp to be moved relative to the lens' focal point , to increase or decrease the size of the light beam. As a result, they are very flexible, and can often produce a beam as narrow as 7° or as wide as 70°. The Fresnel lens produces a very soft-edged beam, so is often used as a wash light. A holder in front of

1443-859: A position. Perhaps the most widespread use of Fresnel lenses, for a time, occurred in automobile headlamps , where they can shape the roughly parallel beam from the parabolic reflector to meet requirements for dipped and main-beam patterns, often both in the same headlamp unit (such as the European H4 design). For reasons of economy, weight, and impact resistance, newer cars have dispensed with glass Fresnel lenses, using multifaceted reflectors with plain polycarbonate lenses. However, Fresnel lenses continue in wide use in automobile tail, marker, and reversing lights. Glass Fresnel lenses also are used in lighting instruments for theatre and motion pictures (see Fresnel lantern ); such instruments are often called simply Fresnels . The entire instrument consists of

1554-486: A rotating array outside the fixed array. Each panel of the rotating array was to refract part of the fixed light from a horizontal fan into a narrow beam. Also in 1825, Fresnel unveiled the Carte des Phares ('lighthouse map'), calling for a system of 51 lighthouses plus smaller harbor lights, in a hierarchy of lens sizes called "orders" (the first being the largest), with different characteristics to facilitate recognition:

1665-578: A state legislature in the United States. She was outed against her will following the election and served one term. As of 2018, the General Court was composed of 75 percent male and 25 percent female representation. There are 40 senatorial districts in Massachusetts, named for the counties in which they are located. There are 160 representational districts in Massachusetts, named for the counties in which they are located. The speaker of

1776-557: A substantial reduction in thickness (and thus mass and volume of material) at the expense of reducing the imaging quality of the lens, which is why precise imaging applications such as photography usually still use larger conventional lenses. Fresnel lenses are usually made of glass or plastic; their size varies from large (old historical lighthouses, meter size) to medium (book-reading aids, OHP viewgraph projectors) to small ( TLR / SLR camera screens, micro-optics). In many cases they are very thin and flat, almost flexible, with thicknesses in

1887-608: A system similar to Condorcet's in 1811, and by 1820 was advocating its use in British lighthouses. The French Commission des Phares  [ FR ] (Commission of Lighthouses) was established by Napoleon in 1811, and placed under the authority of French physicist Augustin-Jean Fresnel 's employer, the Corps of Bridges and Roads. As the members of the commission were otherwise occupied, it achieved little in its early years. However, on 21 June 1819—three months after winning

1998-513: A way to remove defects by reheating and remolding the glass. Arago assisted Fresnel with the design of a modified Argand lamp with concentric wicks (a concept that Fresnel attributed to Count Rumford ), and accidentally discovered that fish glue was heat-resistant, making it suitable for use in the lens. The prototype, finished in March 1820, had a square lens panel 55   cm on a side, containing 97 polygonal (not annular) prisms—and so impressed

2109-856: Is a bicameral body . The upper house is the Massachusetts Senate which is composed of 40 members. The lower body , the Massachusetts House of Representatives , has 160 members; until 1978, the state house had 240 members. It meets in the Massachusetts State House on Beacon Hill in Boston. Since 1959, Democrats have controlled both houses of the Massachusetts General Court, often by large majorities. The Democrats enjoyed veto-proof supermajorities in both chambers for part of

2220-457: Is a full-time legislature, although not to the extent of neighboring New York or some other states. The earliest history of the General Court is in the original charter of 1629. Massachusetts Bay Colony , one of the original Thirteen Colonies , was a royally chartered joint stock company founded in 1628 in London . Much like other joint-stock companies of the time the first General Court

2331-543: Is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. The simpler dioptric (purely refractive ) form of the lens was first proposed by Georges-Louis Leclerc, Comte de Buffon , and independently reinvented by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses . The catadioptric (combining refraction and reflection) form of

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2442-412: Is composed of six senators and eleven representatives. The standing committees schedule public hearings for the individual bills, which afford citizens, legislators and lobbyists the opportunity to express their views. Committee members meet at a later time in executive session to review the public testimony and discuss the merits of each bill before making their recommendations to the full membership of

2553-487: Is much decayed, but has a nearly new roof and weather boarding on it, and may last for some years yet." A similar recommendation to the Board dated October 22, 1853, from Even W. Allen, Collector and Superintendent, District of Nantucket, reads in part "The whole establishment at Brant Point is very much out of repair, and from the age, material, and construction of the building, I should not consider it good economy to repair it;

2664-405: Is of hammered granite, laid in courses two feet thick to the height of 12 ft (3.7 m). The interior of the base forms a cistern, where water may be caught for household purposes. The column forming the tower is of brick laid in cement, with an airspace within the walls for ventilation. The lamp is of cast iron, with 12 lights of plate glass. A circular iron stairway winds its spiral way up to

2775-459: Is on. They attach to the passenger-side window. Another automobile application of a Fresnel lens is a rear view enhancer, as the wide view angle of a lens attached to the rear window permits examining the scene behind a vehicle, particularly a tall or bluff-tailed one, more effectively than a rear-view mirror alone. Fresnel lenses have been used on rangefinding equipment and projected map display screens. Fresnel lenses have also been used in

2886-737: Is referred to the Senate or House Committee on Ways and Means after the first reading. Adverse reports ("ought not to pass") are also referred to the Committee on Steering and Policy in the Senate or placed without debate in the Orders of the Day for the next session of the House. Acceptance by either branch of an adverse report is considered the final rejection and the matter of the matter. However, an adverse report can be overturned. A member may move to substitute

2997-475: Is the double-flashing lens of the Point Arena Light , which was in service from 1908 to 1977. The development of hyper-radial lenses was driven in part by the need for larger light sources, such as gas lights with multiple jets, which required a longer focal length for a given beam-width, hence a larger lens to collect a given fraction of the generated light. The first hyper-radial lens was built for

3108-3325: Is the only news organization with floor privileges and a desk in both the House and Senate chambers. 1 (1780) 2 (1781) 3 (1782) 4 (1783) 5 (1784) 6 (1785) 7 (1786) 8 (1787) 9 (1788) 10 (1789) 11 (1790) 12 (1791) 13 (1792) 14 (1793) 15 (1794) 16 (1795) 17 (1796) 18 (1797) 19 (1798) 20 (1799) 21 (1800) 22 (1801) 23 (1802) 24 (1803) 25 (1804) 26 (1805) 27 (1806) 28 (1807) 29 (1808) 30 (1809) 31 (1810) 32 (1811) 33 (1812) 34 (1813) 35 (1814) 36 (1815) 37 (1816) 38 (1817) 39 (1818) 40 (1819) 41 (1820) 42 (1821) 43 (1822) 44 (1823) 45 (1824) 46 (1825) 47 (1826) 48 (1827) 49 (1828) 50 (1829) 51 (1830) 52 (1831) 53 (1832) 54 (1833) 55 (1834) 56 (1835) 57 (1836) 58 (1837) 59 (1838) 60 (1839) 61 (1840) 62 (1841) 63 (1842) 64 (1843) 65 (1844) 66 (1845) 67 (1846) 68 (1847) 69 (1848) 70 (1849) 71 (1850) 72 (1851) 73 (1852) 74 (1853) 75 (1854) 76 (1855) 77 (1856) 78 (1857) 79 (1858) 80 (1859) 81 (1860) 82 (1861) 83 (1862) 84 (1863) 85 (1864) 86 (1865) 87 (1866) 88 (1867) 89 (1868) 90 (1869) 91 (1870) 92 (1871) 93 (1872) 94 (1873) 95 (1874) 96 (1875) 97 (1876) 98 (1877) 99 (1878) 100 (1879) 101 (1880) 102 (1881) 103 (1882) 104 (1883) 105 (1884) 106 (1885) 107 (1886) 108 (1887) 109 (1888) 110 (1889) 111 (1890) 112 (1891) 113 (1892) 114 (1893) 115 (1894) 116 (1895) 117 (1896) 118 (1897) 119 (1898) 120 (1899) 121 (1900) 122 (1901) 123 (1902) 124 (1903) 125 (1904) 126 (1905) 127 (1906) 128 (1907) 129 (1908) 130 (1909) 131 (1910) 132 (1911) 133 (1912) 134 (1913) 135 (1914) 136 (1915) 137 (1916) 138 (1917) 139 (1918) 140 (1919) 141 (1920) 142 (1921) 143 (1923) 144 (1925) 145 (1927) 146 (1929) 147 (1931) 148 (1933) 149 (1935) 150 (1937) 151 (1939) 152 (1941) 153 (1943) 154 (1945) 155 (1947) 156 (1949) 157 (1951) 158 (1953) 159 (1955) 160 (1957) 161 (1959) 162 (1961) 163 (1963) 164 (1965) 165 (1967) 166 (1969) 167 (1971) 168 (1973) 169 (1975) 170 (1977) 171 (1979) 172 (1981) 173 (1983) 174 (1985) 175 (1987) 176 (1989) 177 (1991) 178 (1993) 179 (1995) 180 (1997) 181 (1999) 182 (2001) 183 (2003) 184 (2005) 185 (2007) 186 (2009) 187 (2011) 188 (2013) 189 (2015) 190 (2017) 191 (2019) 192 (2021) 193 (2023) 194 (2025) Fresnel lens A Fresnel lens ( / ˈ f r eɪ n ɛ l , - n əl / FRAY -nel, -⁠nəl ; / ˈ f r ɛ n ɛ l , - əl / FREN -el, -⁠əl ; or / f r eɪ ˈ n ɛ l / fray- NEL )

3219-414: The École Polytechnique , in order to save his remaining time and energy for his lighthouse work. In the same year he designed the first fixed lens—for spreading light evenly around the horizon while minimizing waste above or below. Ideally the curved refracting surfaces would be segments of toroids about a common vertical axis, so that the dioptric panel would look like a cylindrical drum. If this

3330-478: The 1 to 5 mm ( 1 ⁄ 32 to 3 ⁄ 16  in) range. Most modern Fresnel lenses consist only of refractive elements. Lighthouse lenses, however, tend to include both refracting and reflecting elements, the latter being outside the metal rings seen in the photographs. While the inner elements are sections of refractive lenses, the outer elements are reflecting prisms, each of which performs two refractions and one total internal reflection , avoiding

3441-513: The Isle of May , Scotland, on 22 September 1836. The first large catadioptric lenses were made in 1842 for the lighthouses at Gravelines and Île Vierge , France; these were fixed third-order lenses whose catadioptric rings (made in segments) were one metre in diameter. Stevenson's first-order Skerryvore lens, lit in 1844, was only partly catadioptric; it was similar to the Cordouan lens except that

Brant Point Light - Misplaced Pages Continue

3552-484: The Lighthouse Board that they build a tower for a second-class lens light which would cost $ 15,000. "The frame of the light tower at Brant Point is so completely rotted as to require reconstruction with the least possible delay," the letter continued, "and believing it to be the wise policy of the Board to make all its future construction permanent, I have asked the above amount for the tower. The dwelling house

3663-560: The Meta Quest Pro , have switched to a pancake lens design due to its smaller form factor and less chromatic aberration than Fresnel lenses. Multi-focal Fresnel lenses are also used as a part of retina identification cameras, where they provide multiple in- and out-of-focus images of a fixation target inside the camera. For virtually all users, at least one of the images will be in focus, thus allowing correct eye alignment. Canon and Nikon have used Fresnel lenses to reduce

3774-514: The Sinclair TV80 . They are also used in traffic lights . Fresnel lenses are used in left-hand-drive European lorries entering the UK and Republic of Ireland (and vice versa, right-hand-drive Irish and British trucks entering mainland Europe) to overcome the blind spots caused by the driver operating the lorry while sitting on the wrong side of the cab relative to the side of the road the car

3885-606: The legislature of the Commonwealth of Massachusetts since the adoption of the Massachusetts Constitution in 1780. The body was in operation before Massachusetts became a U.S. state on February 6, 1788 . The first sessions, starting in 1780 , were one-year elected sessions for both houses. This was expanded to two-year sessions starting with the 142nd General Court in January 1921. Thereafter,

3996-488: The transverse wave hypothesis. Shortly after the Cordouan lens was lit, Fresnel started coughing up blood. In May 1824, Fresnel was promoted to Secretary of the Commission des Phares , becoming the first member of that body to draw a salary, albeit in the concurrent role of Engineer-in-Chief. Late that year, being increasingly ill, he curtailed his fundamental research and resigned his seasonal job as an examiner at

4107-619: The 1990s (i.e., enough votes to override vetoes by a governor) and also currently hold supermajorities in both chambers. State senators and representatives both serve two-year terms. There are no term limits ; a term limit was enacted by initiative in Massachusetts in 1994 but in 1997 was struck down by the Massachusetts Supreme Judicial Court , which ruled that it was an unconstitutional attempt to provide additional qualifications for office by statute, rather than constitutional amendment. The legislature

4218-576: The Commission that Fresnel was asked for a full eight-panel version. This model, completed a year later in spite of insufficient funding, had panels 76   cm square. In a public spectacle on the evening of 13 April 1821, it was demonstrated by comparison with the most recent reflectors, which it suddenly rendered obsolete. Soon after this demonstration, Fresnel published the idea that light, including apparently unpolarized light, consists exclusively of transverse waves , and went on to consider

4329-506: The Committee on Bills in the Third Reading. This amounts to preliminary approval of the bill in that branch. That committee examines technical points, as well as the legality and constitutionality of the measure, and ensures that it does not duplicate or contradict existing law. The committee then issues a report and returns the bill to the House or Senate for its third reading. At that time, legislators can further debate and amend

4440-425: The House has historically been quite powerful, exerting significant influence over all aspects of state government. The General Court is responsible for enacting laws in the state. The two legislative branches work concurrently on pending laws brought before them. Lawmaking begins when legislators, or their delegates, file petitions accompanied by bills, resolves or other types of legislation electronically, using

4551-604: The House or Senate. Matters not requiring reference to another Joint, House or Senate committee are, following the first reading, referred without debate to the Committee on Senate Rules if reported in the Senate, except certain special laws (relative to a city or town) are placed directly on the Senate Calendar (Orders of the Day), or, without debate to the House Steering, Policy and Scheduling committee if reported into

Brant Point Light - Misplaced Pages Continue

4662-524: The House or Senate. The Health Care Financing Committee is required to provide an estimated cost of the bill, when making their report. If the estimated cost is less than $ 100,000, the bill bypasses having to be referred to Ways and Means. If a bill is not related to health care, but affects the finances of the Commonwealth, or, if it is reported by the Health Care Financing Committee with an estimated cost greater than $ 100,000, it

4773-512: The House or Senate. The public may still observe "executive" sessions, but may not participate in these meetings. The committee then issues its report, recommending that a bill "ought to pass" or "ought not to pass" and the report is submitted to the Clerk's office. The first reading of a favorably reported bill is automatic and generally occurs when the committee's report appears in the Journal of

4884-558: The House. Reports from Senate Rules or House Steering, Policy and Scheduling are placed on the Calendar of the Chamber receiving the report for a second reading. If a bill reported favorably by a joint committee affects health care it is referred by the House or Senate Clerk to the joint committee on Health Care Financing; and the first reading is delayed until the next favorable report, thus allowing Health Care Financing to report to either

4995-597: The Legislative Automated Workflow System (LAWS). The electronically submitted legislation is received in the House or Senate Clerk's office where the petitions , bills , and resolves are recorded in an electronic docket book. The clerks number the bills and assign them to appropriate joint committees. There are 26 of these committees, each responsible for studying the bills which pertain to specific policy areas, taxation , education , health care , insurance , and others. Each committee

5106-626: The Light-House on that Island, besides several Shops, Barns, etc. Had the Gust continued fifteen Minutes it is thought it would not have left more than half the Buildings standing, in the Course that it passed. But we don’t hear of any Persons receiving much hurt, nor much Damage done, except the loss of the Light-House which in every respect is considerable." Town meeting promptly agreed to rebuild

5217-519: The March 12, 1774, issue of The Massachusetts Gazette and the Boston PostBoy and Advertiser , "We hear from Nantucket that on Wednesday the 9th of March Instant (1774) at about 8 o’clock in the Morning, they had a most violent Gust of Wind that perhaps was ever known there, but it lasted only about a Minute. It seemed to come in a narrow Vein, and in its progress blew down. and totally destroyed

5328-464: The Rogers mirror of 60 years earlier, except that it subtended a whole hemisphere). Light radiated into the forward hemisphere but missing the bull's-eye lens was deflected by the paraboloid into a parallel beam surrounding the bull's-eye lens, while light radiated into the backward hemisphere was reflected back through the lamp by the spherical reflector (as in Rogers' arrangement), to be collected by

5439-467: The Stevensons in 1885 by F. Barbier & Cie of France, and tested at South Foreland Lighthouse with various light sources. Chance Brothers (Hopkinson's employers) then began constructing hyper-radials, installing their first at Bishop Rock Lighthouse in 1887. In the same year, Barbier installed a hyper-radial at Tory Island . But only about 30 hyper-radials went into service before

5550-464: The United States by the 1870s. In 1858 the company produced "a very small number of pressed flint-glass sixth-order lenses" for use in lighthouses—the first Fresnel lighthouse lenses made in America. By the 1950s, the substitution of plastic for glass made it economic to use Fresnel lenses as condensers in overhead projectors. The Fresnel lens reduces the amount of material required compared to

5661-557: The actors and the camera, distorting the scale and composition of the scene to humorous effect. The Pixar movie Wall-E features a Fresnel lens in the scenes where the protagonist watches the musical Hello, Dolly! magnified on an iPod . Virtual reality headsets, such as the Meta Quest 2 and the HTC Vive Pro use Fresnel lenses, as they allow a thinner and lighter form factor than regular lenses. Newer devices, such as

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5772-434: The authority of the General Court. Under this new system the religious qualification, that suffrage be for only Puritan men, was changed to a qualification of property ownership. The Assistants were also officially changed to a Governor's Council to be selected by the governor to act as an upper house as well as a council for advice and consent . All laws passed by the General Court were to be approved by Royal Governor of

5883-417: The bill for the report, and, if the motion to substitute carries, the matter is then given its first reading and follows the same procedure as if reported favorably by committee. After a bill is read for a second time, it is open to debate on amendments and motions . Following debate, a vote is taken and if the bill receives a favorable vote by the membership, it is ordered to a third reading and referred to

5994-425: The bill, first in the House and later in the Senate, is the final step in the passage of a bill by the legislature. Following enactment, the bill goes to the governor , who may sign the bill into law, allow it to become law without signing it (if the governor holds the bill for ten days without taking any action while the legislature is in session, it becomes law without his or her signature), veto it, or return it to

6105-554: The bill. Following the third reading, the body votes on "passing the bill to be engrossed." The bill must then pass through three readings and engrossment in the second legislative branch. Should that occur, it is sent to the Legislative Engrossing Division where it is typed on special parchment in accordance with the General Laws . However, if the second branch passes an amended version of the bill,

6216-824: The book burnt on Boston Common . With the collapse of the Dominion of New England in the Glorious Revolution in 1689 The Assistants convened an assembly of delegates from each town to reform the General Court. With the Massachusetts Charter in 1691 the Province of Massachusetts Bay absorbed the colony of Plymouth . The Plymouth Colony , along with the District of Maine and the islands off Cape Cod , Martha's Vineyard and Nantucket were to be an extension of Massachusetts and thus under

6327-510: The center, were installed at the Old Lower Lighthouse at Portland Bill in 1789. Behind each lamp was a back-coated spherical glass mirror, which reflected rear radiation back through the lamp and into the lens. Further samples were installed at Howth Baily , North Foreland , and at least four other locations by 1804. But much of the light was wasted by absorption in the glass. In 1748, Georges-Louis Leclerc, Comte de Buffon

6438-405: The center. The result was an all-glass holophote, with no losses from metallic reflections. James Timmins Chance modified Thomas Stevenson's all-glass holophotal design by arranging the double-reflecting prisms about a vertical axis. The prototype was shown at the 1862 International Exhibition in London. Later, to ease manufacturing, Chance divided the prisms into segments, and arranged them in

6549-548: The city on March 17, 1776. The Governor's Council acted as the executive in the absence of the governor and lieutenant governor, administering the rebel forces of the colony during the early years of the American Revolutionary War , which began in Massachusetts at the Battles of Lexington and Concord on April 19, 1775. The General Assembly declared Massachusetts independent from Britain on May 1, 1776. With

6660-659: The colony. Soon after, Governor John Winthrop and the Deputy Governor Thomas Dudley broke with protocol when they themselves traveled to New England and moved the government to Massachusetts Bay. Along with them came the stock holders of the company and the Council of Assistants . Once in the Massachusetts Bay Colony, the new government reorganized itself out of convenience. Instead of attempting to assemble all stockholders to

6771-435: The company. These officials were to have royally assented governmental control of the colony and would be tasked with the management and defense of the colonial plantation. The first Court assembled would be made from these members to discuss and evaluate the situation of the colony. The first meeting of the original General Court took place in London in 1629. The General Court selected John Endicott as its representative to

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6882-512: The completion of Augustin Fresnel's original Carte des Phares . Thomas Stevenson (younger brother of Alan) went a step beyond Fresnel with his "holophotal" lens, which focused the light radiated by the lamp in nearly all directions, forward or backward, into a single beam. The first version, described in 1849, consisted of a standard Fresnel bull's-eye lens, a paraboloidal reflector, and a rear hemispherical reflector (functionally equivalent to

6993-631: The curved surfaces are replaced with flat surfaces, with a different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion with steeper prisms on the edges and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism. 'Single-piece' Fresnel lenses were later produced, being used for automobile headlamps, brake, parking, and turn signal lenses, and so on. In modern times, computer-controlled milling equipment (CNC) or 3-D printers might be used to manufacture more complex lenses. Fresnel lens design allows

7104-549: The development of more compact bright lamps rendered such large optics unnecessary (see Hyperradiant Fresnel lens ). Production of one-piece stepped dioptric lenses—roughly as envisaged by Buffon—became feasible in 1852, when John L. Gilliland of the Brooklyn Flint-Glass Company patented a method of making lenses from pressed and molded glass. The company made small bull's-eye lenses for use on railroads, steamboats, and docks; such lenses were common in

7215-519: The discretion of local magistrates creating a theocratic quasi-democratic state. By votes of the General Court in the 1630s, the system of government changed to have an elected governor and to restrict the list of "freemen" to those affiliated with certain Puritan churches. In 1634, after complaint the charter was not being followed, a compromise resulted in recomposition of the General Court as two deputies elected by freemen in each town. Problems with

7326-475: The exact date on which Fresnel formally recommended lentilles à échelons is unknown. Much to Fresnel's embarrassment, one of the assembled commissioners, Jacques Charles , recalled Buffon's suggestion. However, whereas Buffon's version was biconvex and in one piece, Fresnel's was plano-convex and made of multiple prisms for easier construction. With an official budget of 500 francs, Fresnel approached three manufacturers. The third, François Soleil, found

7437-572: The field of popular entertainment. The British rock artist Peter Gabriel made use of them in his early solo live performances to magnify the size of his head, in contrast to the rest of his body, for dramatic and comic effect. In the Terry Gilliam film Brazil , plastic Fresnel screens appear ostensibly as magnifiers for the small CRT monitors used throughout the offices of the Ministry of Information. However, they occasionally appear between

7548-641: The form of the Governor, the Governor's Council, etc. had more executive authority the Court could cause political stalemate if its demands were not met. Even the Governor's reserve power to dissolve the General Court was ineffective because a new assembly had to be elected the following year. With the passage of the Intolerable Acts by the Parliament of Great Britain there was political turmoil in

7659-478: The forward components. The first unit was installed at North Harbour, Peterhead , in August 1849. Stevenson called this version a "catadioptric holophote", although each of its elements was either purely reflective or purely refractive. In the second version of the holophote concept, the bull's-eye lens and paraboloidal reflector were replaced by a catadioptric Fresnel lens—as conceived by Fresnel, but expanded to cover

7770-433: The implications for double refraction and partial reflection. Fresnel acknowledged the British lenses and Buffon's invention in a memoir read on 29 July 1822 and printed in the same year. The date of that memoir may be the source of the claim that Fresnel's lighthouse advocacy began two years later than Brewster's; but the text makes it clear that Fresnel's involvement began no later than 1819. Fresnel's next lens

7881-460: The interests of the Government and all concerned, seem to demand a more permanent and commodious structure." On August 3, 1854, Congress appropriated $ 15,000 "for rebuilding the lighthouse at Brandt’s Point, Nantucket, State of Massachusetts." The tower was described: "The foundation of the tower is of concrete cement 2 ft (0.61 m) thick, and 18 ft (5.5 m) in diameter. The base

7992-415: The legislation returns to the original branch for a vote of concurrence in the amendment. If concurrence is rejected, a conference committee consisting of the three members from each legislative branch representing both political parties may be formed to effect a compromise piece of legislation. When a compromise is reached, the bill is sent to both legislative branches for their approval. A vote "to enact"

8103-429: The legislative year was defined as: "The first legislative year starting with the opening of the biennial session and ends at midnight on Tuesday before the first Wednesday of the following year. The second legislative year starts on the first Wednesday of the second year and ends when the legislature prorogues or at midnight on Tuesday before the first Wednesday of the following year. Watson F. Hammond , seated in 1885,

8214-462: The legislature with recommended changes. If the legislature has concluded its yearly session, and the governor does not sign the bill within ten days, it dies. This is referred to as a " pocket veto ." This ten-day period includes Sundays and holidays, even if they fall on the tenth day, and it begins the day after the legislation is laid on the governor's desk. A bill signed by the governor, or passed by two-thirds of both branches over his veto, becomes

8325-502: The lens can hold a colored plastic film ( gel ) to tint the light or wire screens or frosted plastic to diffuse it. The Fresnel lens is useful in the making of motion pictures not only because of its ability to focus the beam brighter than a typical lens, but also because the light is a relatively consistent intensity across the entire width of the beam of light. Aircraft carriers and naval air stations typically use Fresnel lenses in their optical landing systems . The "meatball" light aids

8436-403: The lens, entirely invented by Fresnel, has outer prismatic elements that use total internal reflection as well as refraction to capture more oblique light from the light source and add it to the beam, making it visible at greater distances. The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by

8547-468: The light loss that occurs in reflection from a silvered mirror. Fresnel designed six sizes of lighthouse lenses, divided into four orders based on their size and focal length. The 3rd and 4th orders were sub-divided into "large" and "small". In modern use, the orders are classified as first through sixth order. An intermediate size between third and fourth order was added later, as well as sizes above first order and below sixth. A first-order lens has

8658-460: The light source. The light path through these elements can include an internal reflection , rather than the simple refraction in the planar Fresnel element. These lenses conferred many practical benefits upon the designers, builders, and users of lighthouses and their illumination. Among other things, smaller lenses could fit into more compact spaces. Greater light transmission over longer distances, and varied patterns, made it possible to triangulate

8769-408: The lighthouse burned. The first three lighthouses had been built with more of eye to economy than quality, but the fourth had no quality at all. It was simply a wood lantern with glass windows hoisted between two spars. This lamp was very dim and was often compared by mariners to a lightning bug ; hence it received the name "bug light" and was replaced in 1786 by a slightly more elaborate structure,

8880-629: The lighthouse for the third time "as High as the former one that blew down lately at the Town’s Expense." The town petitioned the Massachusetts General Court (the Legislature , not a court) for permission to levy tonnage dues, and, beginning August 1, 1774, it was ordered that any vessel over 15 short tons (14 t) was subject to a charge of 6 shillings the first time each year it entered or left Nantucket Harbor. In 1783,

8991-555: The lower slats were replaced by French-made catadioptric prisms, while mirrors were retained at the top. The first fully catadioptric first-order lens, installed at Pointe d'Ailly in 1852, also gave eight rotating beams plus a fixed light at the bottom; but its top section had eight catadioptric panels focusing the light about 4 degrees ahead of the main beams, in order to lengthen the flashes. The first fully catadioptric lens with purely revolving beams—also of first order—was installed at Saint-Clément-des-Baleines in 1854, and marked

9102-402: The main beam, increasing the duration of the flash. Below the main panels were 128 small mirrors arranged in four rings, stacked like the slats of a louver or Venetian blind . Each ring, shaped like a frustum of a cone , reflected the light to the horizon, giving a fainter steady light between the flashes. The official test, conducted on the unfinished Arc de Triomphe on 20 August 1822,

9213-443: The meeting of the General Court the government decided on having each town elect two representatives to send in their stead. The General Court became a de facto bicameral legislature by virtue of the distinction between delegates elected by towns and the Council of Assistants. The assistants acted as magistrates and counselors of jurisprudence, however when in session they served as a sort of upper house . Their assent and approval

9324-512: The membership. The governor may also declare an act to be an emergency law and make it effective at once. A special act takes effect thirty days from the day it is signed, unless it contains a provision to make it effective immediately. The State House News Service is an independent privately owned wire service based in the Massachusetts State House that provides comprehensive coverage of the Commonwealth's government. It

9435-428: The middle of the 20th centuries; most lighthouses have now retired glass Fresnel lenses from service and replaced them with much less expensive and more durable aerobeacons , which themselves often contain plastic Fresnel lenses. Lighthouse Fresnel lens systems typically include extra annular prismatic elements, arrayed in faceted domes above and below the central planar Fresnel, in order to catch all light emitted from

9546-476: The need for filters by inventing the "group-flashing" lens, in which the dioptric and/or the catadioptric panels were split so as to give multiple flashes—allowing lighthouses to be identified not only by frequency of flashes, but also by multiplicity of flashes. Double-flashing lenses were installed at Tampico (Mexico) and Little Basses (Sri Lanka) in 1875, and a triple-flashing lens at Casquets Lighthouse ( Channel Islands ) in 1876. The example shown (right)

9657-423: The number of segments increases, the two types of lens become more similar to each other. In the abstract case of an infinite number of segments, the difference between curved and flat segments disappears. Imaging lenses can be classified as: Non-imaging lenses can be classified as: High-quality glass Fresnel lenses were used in lighthouses, where they were considered state of the art in the late 19th and through

9768-634: The physics Grand Prix of the Academy of Sciences for his celebrated memoir on diffraction —Fresnel was "temporarily" seconded to the commission on the recommendation of François Arago (a member since 1813), to review possible improvements in lighthouse illumination. By the end of August 1819, unaware of the Buffon-Condorcet-Brewster proposal, Fresnel made his first presentation to the commission, recommending what he called lentilles à échelons ('lenses by steps') to replace

9879-412: The pilot in maintaining proper glide slope for the landing. In the center are amber and red lights composed of Fresnel lenses. Although the lights are always on, the angle of the lens from the pilot's point of view determines the color and position of the visible light. If the lights appear above the green horizontal bar, the pilot is too high. If it is below, the pilot is too low, and if the lights are red,

9990-399: The pilot is very low. Fresnel lenses are also commonly used in searchlights , spotlights , and flashlights . Fresnel lenses are used as simple hand-held magnifiers . They are also used to correct several visual disorders, including ocular-motility disorders such as strabismus . Fresnel lenses have been used to increase the visual size of CRT displays in pocket televisions , notably

10101-529: The province. The powers of the monarch to be expanded in this new system as well. The King had full control of maritime affairs and acted as an executive, through the Royal Governor, to enforce commercial law. This separation of powers led to some friction with the Royal Governor and the General Court. The General Court retained power over spending and budget and while the Royal Officers, in

10212-579: The province. With political disorder Thomas Gage , then the Royal Governor, cancelled the new elections for the General Court and in 1774 the assembly was essentially dissolved. This allowed the governor to rule by decree and appoint town governments. In defiance of both Crown law and Gage, members of the General Court formed the Massachusetts Provincial Congress and seized control of the colony except for Boston, where British troops maintained control until when they evacuated

10323-431: The reflectors then in use, which reflected only about half of the incident light. Another report by Fresnel, dated 29 August 1819 (Fresnel, 1866–70, vol. 3, pp. 15–21), concerns tests on reflectors, and does not mention stepped lenses except in an unrelated sketch on the last page of the manuscript. The minutes of the meetings of the Commission go back only to 1824, when Fresnel himself took over as Secretary. Thus

10434-415: The size of telephoto lenses. Photographic lenses that include Fresnel elements can be much shorter than corresponding conventional lens design. Nikon calls the technology Phase Fresnel . The Polaroid SX-70 camera used a Fresnel reflector as part of its viewing system. View and large format cameras can utilize a Fresnel lens in conjunction with the ground glass , to increase the perceived brightness of

10545-543: The state capital of Boston . The name "General Court" is a holdover from the earliest days of the Massachusetts Bay Colony , when the colonial assembly, in addition to making laws, sat as a judicial court of appeals . Before the adoption of the state constitution in 1780, it was called the Great and General Court , but the official title was shortened by John Adams , author of the state constitution . It

10656-442: The tenth light and seventh tower, was built at the extremity of the point, and the light exhibited there for the first time on January 31, 1901. There was originally a fog bell at the station. That tower, now fitted with a foghorn , is still in use. In 1887 a dispute surfaced over the boundaries of the lighthouse site. This was settled in 1901 when five lots, totaling 5.9 acres (2.4 ha), containing three summer houses and part of

10767-696: The test of the Cordouan lens in Paris, a committee of the Academy of Sciences reported on Fresnel's memoir and supplements on double refraction—which, although less well known to modern readers than his earlier work on diffraction, struck a more decisive blow for the wave theory of light. Between the test and the reassembly at Cordouan, Fresnel submitted his papers on photoelasticity (16 September 1822), elliptical and circular polarization and optical rotation (9 December), and partial reflection and total internal reflection (7 January 1823), essentially completing his reconstruction of physical optics on

10878-534: The third surface. The result was the lighthouse lens as we now know it. In 1826 he assembled a small model for use on the Canal Saint-Martin , but he did not live to see a full-sized version: he died on 14 July 1827, at the age of 39. The first stage of the development of lighthouse lenses after the death of Augustin Fresnel consisted in the implementation of his designs. This was driven in part by his younger brother Léonor—who, like Augustin,

10989-543: The war still ongoing, demands for government reform resulted in the Massachusetts Constitutional Convention of 1778 , but the text proposed by the legislature failed in a statewide voter referendum. The Massachusetts Constitutional Convention of 1779–1780 was held by a specially-elected body, and the resulting text, after amendment and ratification, became the current state constitution. The current Massachusetts General Court has met as

11100-410: The whole forward hemisphere. The third version, which Stevenson confusingly called a "dioptric holophote", was more innovative: it retained the catadioptric Fresnel lens for the front hemisphere, but replaced the rear hemispherical reflector with a hemispherical array of annular prisms, each of which used two total internal reflections to turn light diverging from the center of the hemisphere back toward

11211-549: Was a meeting of shareholders, known as freemen . The "Great and General Court" was to meet in London and elect its officers and members in the same manner as other colonial charted companies of the time such as the Virginia Company and the East India Company . The freemen would meet annually to elect representatives in the form of a Royal Governor, a Deputy Governor, and a Council made from the directors of

11322-407: Was a rotating apparatus with eight "bull's-eye" panels, made in annular arcs by Saint-Gobain , giving eight rotating beams—to be seen by mariners as a periodic flash. Above and behind each main panel was a smaller, sloping bull's-eye panel of trapezoidal outline with trapezoidal elements. This refracted the light to a sloping plane mirror, which then reflected it horizontally, 7 degrees ahead of

11433-478: Was ceded to the United States in 1795." This building, the sixth to be erected on this site, was also cheaply built and was condemned in 1825. A small tower framework, the seventh light, was built on top of the keeper's dwelling in 1825. This had eight lamps arranged in a double row, six in the lower series and two in the upper tier. Behind each of these lamps were 12’ 2-inch reflectors. On November 9, 1853, C. A. Ogden, Major, Topographical Engineers, recommended to

11544-593: Was decided to build and outfit the Makapuu Point Light in Hawaii. Rather than order a new lens, the huge optic construction, 3.7 metres (12 ft) tall and with over a thousand prisms, was used there. There are two main types of Fresnel lens: imaging and non-imaging . Imaging Fresnel lenses use segments with curved cross-sections and produce sharp images, while non-imaging lenses have segments with flat cross-sections, and do not produce sharp images. As

11655-451: Was needed in order for any decision from the house of delegates to be passed. The new legislature was elected annually. Suffrage was allowed only for men who were Puritan church members and freemen. This General Court removed any feudal restraints on the population and codified a Bill of Rights and powers of a judiciary. The General Court also enshrined the Laws of Moses as legal code under

11766-545: Was replaced by the Nantucket Harbor Range Lights . In 1900 a fixed red light was installed at the extremity of Brant Point, 600 ft (180 m) from the 1856 tower, it having been found necessary to move the light outward, owing to changes in the channel. This was the ninth light to be located on the Brant Point site in addition to the Nantucket Harbor Range Lights . In 1901 a new tower,

11877-447: Was supplemented by reflecting ( catoptric ) rings above and below the refracting (dioptric) parts, the entire apparatus would look like a beehive. The second Fresnel lens to enter service was indeed a fixed lens, of third order, installed at Dunkirk by 1 February 1825. However, due to the difficulty of fabricating large toroidal prisms, this apparatus had a 16-sided polygonal plan. In 1825 Fresnel extended his fixed-lens design by adding

11988-503: Was the first Native American to be elected to the body. Florence Slocomb was one of the first three women in the Commonwealth to be elected to the state Legislature and the first woman from Worcester to win a state legislative seat, representing that district from 1926 to 1928. Althea Garrison was elected to the Massachusetts House of Representatives in 1992 and is known as the first transgender person to serve in

12099-578: Was the first to replace a convex lens with a series of concentric annular prisms, ground as steps in a single piece of glass, to reduce weight and absorption. In 1790 (although secondary sources give the date as 1773 or 1788 ), the Marquis de Condorcet suggested that it would be easier to make the annular sections separately and assemble them on a frame; but even that was impractical at the time. These designs were intended not for lighthouses, but for burning glasses . David Brewster , however, proposed

12210-595: Was trained as a civil engineer but, unlike Augustin, had a strong aptitude for management. Léonor entered the service of the Lighthouse Commission in 1825, and went on to succeed Augustin as Secretary. The first fixed lens to be constructed with toroidal prisms was a first-order apparatus designed by the Scottish engineer Alan Stevenson under the guidance of Léonor Fresnel, and fabricated by Isaac Cookson & Co. using French glass; it entered service at

12321-511: Was witnessed by the Commission—and by Louis XVIII and his entourage—from 32 kilometres (20 mi) away. The apparatus was stored at Bordeaux for the winter, and then reassembled at Cordouan Lighthouse under Fresnel's supervision—in part by Fresnel's own hands. On 25 July 1823, the world's first lighthouse Fresnel lens was lit. As expected, the light was visible to the horizon, more than 32 kilometres (20 mi) out. The day before

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